SM465 Steel Speedo Gear? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wixthedog · 05-17-2020, 03:40 PM

So I ran into something I can't Google my way out of and I need the experts help!

My speedometer never has worked so I did some tests and found that the issue was likely inside the transmission. I hooked a drill up to the cable and tested everything from the transmission up and the speedo acted accordingly.

I have since removed the transmission but noticed that the gear end spins when I turn the end shaft. I went ahead and removed the large adapter nut and found a 22t steel gear marked with an "M" instead of the colored plastic thing I was expecting.

Any insight on what this is?

Some pics for reference:

05-17-2020, 03:40 PM	#1
wixthedog Registered User Join Date: Sep 2019 Location: Magnolia, TX Posts: 225	SM465 Steel Speedo Gear? So I ran into something I can't Google my way out of and I need the experts help! My speedometer never has worked so I did some tests and found that the issue was likely inside the transmission. I hooked a drill up to the cable and tested everything from the transmission up and the speedo acted accordingly. I have since removed the transmission but noticed that the gear end spins when I turn the end shaft. I went ahead and removed the large adapter nut and found a 22t steel gear marked with an "M" instead of the colored plastic thing I was expecting. Any insight on what this is? Some pics for reference: Attached Images __________________ Mike 1976 C10 RCLB - 350 - SM465 4 Spd - 4.5"/6" Drop Obligatory Build Thread HERE! 1979 C20 RCLB - 350 - TH350 Auto



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